Pivot mounting for weighing scales



E. B. LOCKE AND J. P. MURRAY. PIVOT MOUNTING FOR WEIGHING SCALES.

APPLICATION HLED ocT. 30. I920.

1,431,966. Patented Oct. 17,1922.

JUL P W W ETORNE S Patented on. 17, 1922.

entree smrss PATENT ZOFElZCE nnweno 3. Leon AND OHN P. MURRAY, or DETROIT, MICHIGAN, ASSIGNOBS, 'BY MESNE ASSIGNMENTS, 'ro THE coMPU'rrus SCALE comm, or DAYTON, 0810, A

CORPORATION 01? OHIO.

' rrvor MOUNTING son-wnrsnrne SCALES.

Application filed October. so, 1920. Serial No. 426,636.

'- Detroit, in the county of Wayne and State of Michigan, have invented certznn newand useful Improvements in Pivot Mountings for Weighing Scalesfofwvhich the followingis 2.. full, clear, and exact'description.

In: the manufacture of weighing scales, one of the-most troublesome operations 15 the sealing of the levers and other elements enibodying pivots. Notwithstanding the fact that the designer ofthe scale may have located the pivots at the theoretically correct locations, the assembler will frequentl; hnd that the levers do not balance properly and it becomes necessary to adjust the pivots in some manner to bring the levers to proper balance.

" This operation which is known as sealing even with them the operations are time-consuxning and add greatly to the assembly expense.

The present invention has for IlZS OlHBClZS the provision of a pivot mounting which will facilitate the proper locating of the )ivots and also to provide a mounting whic will be comparatively simple and inexpensive to manufacture.

In the drawings: Figure 1 shows a scale lever embodying the improved pivot mountin Fig. 2 is an enlarged side view of the pivot portion of the lever.

Fig. 3 shows a top plan view of the parts shown in Fig. 2.

Fig. 4 is a detail perspective view of the notched bushing.

Fig. 5 is a perspective view of a. knifeedge pivot.

ig. 6 shows the knife-edge placed in the notch in the bushing prior to the final clamping! operation.

To more detail. 10 represents a lever or scale element which is to be provided with a number of pivots. This element is drilled with straight round holes 11. The centers of these holes are located upon the vertical pivot center lines and are to one side of the run e line of the lever as shown in Fig. 1. W it till these holes are placed bushings 12, preferably made of brass and fittin the holes with a snug but slipping" fit. ach buslnngis provided with a, deep V-sha ed notch 13 having the bottom thereof be ow the center of the bushing. The angle between the sides of this notch is sli htlyless I then the angle between the sidesof the knifeed geor pivot l llsee Fig. 6). In assembling thepsrts the knife-edge pivots are slipped into the notches (Fig. 6) and these parts are then inserted into the holes in the lever. Thereafter set screws 15, which are threaded into holes in the lever, are tightened. Each set screw bears down upon the arcuete top of the knife-edge and as the set screw is tightened the knife-edge acts as a wedge upon the bushin to spread it and clump it tightly in the ho e in the lever.

Should it be found that the lever be out of balance and a change of pivot location be necessary. the assembler loosens the set screw and by means of pliers or other suitable tool twists the knife-edge pivot to the left or right until the proper setting is obtained. Thereafter-the set screw is tightened and the knife-edge pivot is again firmly retained in the position to which it has been set.

What we claim is: c

I. An adjustable pivot mounting for a scale element comprising a scale element with a round opening therein, a notched bushing in said opening, a. pivot carried in the said 11otcl1,nnd means carried by the element and coacting with the pivot to wedge the same into the notch in the bushing and clamp the latter in the scale element.

2. An adjustable pivot moiuiting for a scale element comprising a scale element with round openings therein adjacent the pivotcenter bushings in said opening, said bushings having V-sheped notches therein extending beyond the centers thereof, knife edge pivots within said notches, and set screws carried by the scale element and coacting with the knife-edges to Wedge the latter into the notches of the bushings where- :y the bushings are spread and clamped in position in the scale element.

3. An adjustable pivot mounting for a weighing scale element comprising a notched bushing mounted in said element and adopted lobe rotatably ad'usted therein, a pivotmounted in saidbushing and having .surfaces dis osed at an angle to the surfaces of the notofsziid pivot having an arcuute top portion and ai'set, screw carried by the scale element and adapted to be adv'anced into contact with the arcuate-top of thepivot whereby the latter acts as a wedge and spreads the bushing .to prevent relative movement of the bushing and the scale element;

4.-An adjustable '=pivotmounting for a scale element, comprising in combination, an iip'ertui'ed element, a bushing. within said aperture and rotatably adjustable thereto, apivotoerried'by said bushing and having a be'aring md eieccentric to the bushing center ranjd ,mfjustable retaining-means for securing said bu'shing'in position in the element, said-retaining means being adapted toemnitathe lmife-ed ennd Bushing to be me d: toithere'b disol ace-the bearing edge of-tl1e:=pivot relatively to the scale element.

5. An 2; justnble pivot mounting for a scale element conipl'isin v a/sicale element with a round opening e'rein, a' notched bushing in said opening, aipivot .cer 'ied' in said notch, and means carniedbythe scale element for spreading the notchedbushing to the -eby clamp the'samein the opening in the scale -elon1ent and for concurrently clamping the adjustment. e

6. An adjustable ivot mounting for a scale element comprising a scale element haw ing a round opening therein, a notched bushing in said opening, a pivot carried thereb in saidnotoh, and means including an ad justuble device carried by the scale eleznent for spreading the notched bushing to clamp the latter in the element and for retaining the pivot in the desired position-of adjust ment therein.

pivot the desired position of In testimony whereof we heretoafi'ix our 45 signatures.

- EDWARD B. LOCKE. JOHN P; MURRAY: 

